目的评价3D-Magnetic Resonance Cholangiopancreatography(MRCP)与Balance fast field echo(Balance-FFE)及常规MRI序列联合应用对梗阻性黄疸的诊断价值。方法 156例梗阻性黄疸患者行包括3D-MRCP、冠状位B-FFE、轴位T1WI、T2WI、T2压脂...目的评价3D-Magnetic Resonance Cholangiopancreatography(MRCP)与Balance fast field echo(Balance-FFE)及常规MRI序列联合应用对梗阻性黄疸的诊断价值。方法 156例梗阻性黄疸患者行包括3D-MRCP、冠状位B-FFE、轴位T1WI、T2WI、T2压脂,部分行同层动态增强检查。所有影像诊断结果与最终手术病理结果进行回顾对照分析。结果 156例病人分为3组,组Ⅰ结石94例,组Ⅱ肿瘤56例,组Ⅲ其它6例。3D-MRCP、B-FFE与常规MRI联合应用,定性诊断的符合率分别为100%、80.3%和100%,总符合率为92.9%。结论 3D-MRCP、B-FFE与常规MRI扫描序列联合应用通过观察直接征象和间接征象,对梗阻性黄疸的定性诊断有较高准确性。展开更多
This study shows the impact of fuzzy front end （FFE） phase during innovation process on new product development （NPD） project success in two East Asian countries--Korea and Japan was explored via employing compara...This study shows the impact of fuzzy front end （FFE） phase during innovation process on new product development （NPD） project success in two East Asian countries--Korea and Japan was explored via employing comparative study. Authors decided to consider two East Asian countries＇ successful periods as comparison samples for the study of this issue. The 1980s are considered to be ＂golden age＂ of Japanese manufacturing firms when they were extremely successful on global market. Korean firms are enjoying competitive advantage in the late 2000s and the beginning of the 2010s. A conceptual model was developed based on previous research. The model was tested using data from 293 Korean manufacturing firms in the late 2000s and from 540 Japanese manufacturing firms in the late 1980s using structural equation modeling （SEM） technique. In both countries, the effect of intensity of planning on efficiency, prior to the development, was high. Moreover, effect of market uncertainties on effectiveness was significant. Therefore, effective initial planning and good analysis of market prior to the development have positive impacts on NPD project success. In the late 80s, in the period of stability of the economy in the world, the Japanese finns were successful concentrating more on FFE activities, such as market and technological research and initial planning. However, in the 2000s when the world economy started to change so fast and the demands for the goods change so fast, the Korean firms became more successful, thanks to flexibility in the system of NPD project strategies where system was not fixed to the initial plans but where the changes within the project execution phase were allowed. Thus Korean and Japanese firms had different strategies in NPD process in the two different periods. Japanese firms were concentrated more on FFE activities and tended to keep initial plans during development process, while the Korean firms were more flexible in project execution phase allowing dramatic changes to the initial plans.展开更多
目的 研究3.0T磁共振平衡式快速场回波(balance fast field echo,B-FFE)和磁敏感加权成像(susceptibility weighted imaging,SWI)序列在胎儿脊柱方面的诊断价值,为产前诊断提供数据分析及参考。方法 甄选我院2019年10月至2020年3月产前...目的 研究3.0T磁共振平衡式快速场回波(balance fast field echo,B-FFE)和磁敏感加权成像(susceptibility weighted imaging,SWI)序列在胎儿脊柱方面的诊断价值,为产前诊断提供数据分析及参考。方法 甄选我院2019年10月至2020年3月产前诊断提示胎儿脊柱异常并已行超声检查54例孕妇。采用3.0T磁共振进行胎儿脊柱扫描,扫描序列包括轴冠矢三个位置的B-FFE和SWI序列,对两个序列诊断准确率、检查成功率进行对比分析,记录两序列特异性吸收率(the specific absorption rate,SAR)值。结果 54例患者中,B-FFE、SWI序列组诊断准确率分别为88.88%、70.37%,差异具有统计学意义(χ^(2)=5.708,P<0.05)。检查成功率方面:B-FFE、SW序列成功率分别为92.59%、55.56%,差异具有显著统计学意义(χ^(2)=21.027,P<0.001)。SAR值方面:B-FFE、SWI序列分别为2.0±0.05w/kg、<0.1 w/kg。结论 B-FFE与SWI序列对比,两者均能很好的显示胎儿脊柱问题图像,都具有较高的诊断准确率。B-FFE序列检查成功率更高、能获得稳定、清晰图像,在显示胎儿脊柱轮廓稍逊于SWI序列,SWI在显示胎儿腰骶段具有绝对优势,但检查成功率较低,两者结合扫描,能大大提高胎儿脊柱影像诊断准确率及检查完成率。展开更多
文摘目的评价3D-Magnetic Resonance Cholangiopancreatography(MRCP)与Balance fast field echo(Balance-FFE)及常规MRI序列联合应用对梗阻性黄疸的诊断价值。方法 156例梗阻性黄疸患者行包括3D-MRCP、冠状位B-FFE、轴位T1WI、T2WI、T2压脂,部分行同层动态增强检查。所有影像诊断结果与最终手术病理结果进行回顾对照分析。结果 156例病人分为3组,组Ⅰ结石94例,组Ⅱ肿瘤56例,组Ⅲ其它6例。3D-MRCP、B-FFE与常规MRI联合应用,定性诊断的符合率分别为100%、80.3%和100%,总符合率为92.9%。结论 3D-MRCP、B-FFE与常规MRI扫描序列联合应用通过观察直接征象和间接征象,对梗阻性黄疸的定性诊断有较高准确性。
文摘This study shows the impact of fuzzy front end （FFE） phase during innovation process on new product development （NPD） project success in two East Asian countries--Korea and Japan was explored via employing comparative study. Authors decided to consider two East Asian countries＇ successful periods as comparison samples for the study of this issue. The 1980s are considered to be ＂golden age＂ of Japanese manufacturing firms when they were extremely successful on global market. Korean firms are enjoying competitive advantage in the late 2000s and the beginning of the 2010s. A conceptual model was developed based on previous research. The model was tested using data from 293 Korean manufacturing firms in the late 2000s and from 540 Japanese manufacturing firms in the late 1980s using structural equation modeling （SEM） technique. In both countries, the effect of intensity of planning on efficiency, prior to the development, was high. Moreover, effect of market uncertainties on effectiveness was significant. Therefore, effective initial planning and good analysis of market prior to the development have positive impacts on NPD project success. In the late 80s, in the period of stability of the economy in the world, the Japanese finns were successful concentrating more on FFE activities, such as market and technological research and initial planning. However, in the 2000s when the world economy started to change so fast and the demands for the goods change so fast, the Korean firms became more successful, thanks to flexibility in the system of NPD project strategies where system was not fixed to the initial plans but where the changes within the project execution phase were allowed. Thus Korean and Japanese firms had different strategies in NPD process in the two different periods. Japanese firms were concentrated more on FFE activities and tended to keep initial plans during development process, while the Korean firms were more flexible in project execution phase allowing dramatic changes to the initial plans.
文摘目的 研究3.0T磁共振平衡式快速场回波(balance fast field echo,B-FFE)和磁敏感加权成像(susceptibility weighted imaging,SWI)序列在胎儿脊柱方面的诊断价值,为产前诊断提供数据分析及参考。方法 甄选我院2019年10月至2020年3月产前诊断提示胎儿脊柱异常并已行超声检查54例孕妇。采用3.0T磁共振进行胎儿脊柱扫描,扫描序列包括轴冠矢三个位置的B-FFE和SWI序列,对两个序列诊断准确率、检查成功率进行对比分析,记录两序列特异性吸收率(the specific absorption rate,SAR)值。结果 54例患者中,B-FFE、SWI序列组诊断准确率分别为88.88%、70.37%,差异具有统计学意义(χ^(2)=5.708,P<0.05)。检查成功率方面:B-FFE、SW序列成功率分别为92.59%、55.56%,差异具有显著统计学意义(χ^(2)=21.027,P<0.001)。SAR值方面:B-FFE、SWI序列分别为2.0±0.05w/kg、<0.1 w/kg。结论 B-FFE与SWI序列对比,两者均能很好的显示胎儿脊柱问题图像,都具有较高的诊断准确率。B-FFE序列检查成功率更高、能获得稳定、清晰图像,在显示胎儿脊柱轮廓稍逊于SWI序列,SWI在显示胎儿腰骶段具有绝对优势,但检查成功率较低,两者结合扫描,能大大提高胎儿脊柱影像诊断准确率及检查完成率。
